1 files changed, 758 insertions, 0 deletions

diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
new file mode 100644
index 000000000..5b7d6c16d
--- /dev/null
+++ b/tools/perf/util/srcline.c
@@ -0,0 +1,758 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/zalloc.h>
+
+#include "util/dso.h"
+#include "util/debug.h"
+#include "util/callchain.h"
+#include "util/symbol_conf.h"
+#include "srcline.h"
+#include "string2.h"
+#include "symbol.h"
+
+bool srcline_full_filename;
+
+static const char *dso__name(struct dso *dso)
+{
+	const char *dso_name;
+
+	if (dso->symsrc_filename)
+		dso_name = dso->symsrc_filename;
+	else
+		dso_name = dso->long_name;
+
+	if (dso_name[0] == '[')
+		return NULL;
+
+	if (!strncmp(dso_name, "/tmp/perf-", 10))
+		return NULL;
+
+	return dso_name;
+}
+
+static int inline_list__append(struct symbol *symbol, char *srcline,
+			       struct inline_node *node)
+{
+	struct inline_list *ilist;
+
+	ilist = zalloc(sizeof(*ilist));
+	if (ilist == NULL)
+		return -1;
+
+	ilist->symbol = symbol;
+	ilist->srcline = srcline;
+
+	if (callchain_param.order == ORDER_CALLEE)
+		list_add_tail(&ilist->list, &node->val);
+	else
+		list_add(&ilist->list, &node->val);
+
+	return 0;
+}
+
+/* basename version that takes a const input string */
+static const char *gnu_basename(const char *path)
+{
+	const char *base = strrchr(path, '/');
+
+	return base ? base + 1 : path;
+}
+
+static char *srcline_from_fileline(const char *file, unsigned int line)
+{
+	char *srcline;
+
+	if (!file)
+		return NULL;
+
+	if (!srcline_full_filename)
+		file = gnu_basename(file);
+
+	if (asprintf(&srcline, "%s:%u", file, line) < 0)
+		return NULL;
+
+	return srcline;
+}
+
+static struct symbol *new_inline_sym(struct dso *dso,
+				     struct symbol *base_sym,
+				     const char *funcname)
+{
+	struct symbol *inline_sym;
+	char *demangled = NULL;
+
+	if (!funcname)
+		funcname = "??";
+
+	if (dso) {
+		demangled = dso__demangle_sym(dso, 0, funcname);
+		if (demangled)
+			funcname = demangled;
+	}
+
+	if (base_sym && strcmp(funcname, base_sym->name) == 0) {
+		/* reuse the real, existing symbol */
+		inline_sym = base_sym;
+		/* ensure that we don't alias an inlined symbol, which could
+		 * lead to double frees in inline_node__delete
+		 */
+		assert(!base_sym->inlined);
+	} else {
+		/* create a fake symbol for the inline frame */
+		inline_sym = symbol__new(base_sym ? base_sym->start : 0,
+					 base_sym ? (base_sym->end - base_sym->start) : 0,
+					 base_sym ? base_sym->binding : 0,
+					 base_sym ? base_sym->type : 0,
+					 funcname);
+		if (inline_sym)
+			inline_sym->inlined = 1;
+	}
+
+	free(demangled);
+
+	return inline_sym;
+}
+
+#ifdef HAVE_LIBBFD_SUPPORT
+
+/*
+ * Implement addr2line using libbfd.
+ */
+#define PACKAGE "perf"
+#include <bfd.h>
+
+struct a2l_data {
+	const char 	*input;
+	u64	 	addr;
+
+	bool 		found;
+	const char 	*filename;
+	const char 	*funcname;
+	unsigned 	line;
+
+	bfd 		*abfd;
+	asymbol 	**syms;
+};
+
+static int bfd_error(const char *string)
+{
+	const char *errmsg;
+
+	errmsg = bfd_errmsg(bfd_get_error());
+	fflush(stdout);
+
+	if (string)
+		pr_debug("%s: %s\n", string, errmsg);
+	else
+		pr_debug("%s\n", errmsg);
+
+	return -1;
+}
+
+static int slurp_symtab(bfd *abfd, struct a2l_data *a2l)
+{
+	long storage;
+	long symcount;
+	asymbol **syms;
+	bfd_boolean dynamic = FALSE;
+
+	if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
+		return bfd_error(bfd_get_filename(abfd));
+
+	storage = bfd_get_symtab_upper_bound(abfd);
+	if (storage == 0L) {
+		storage = bfd_get_dynamic_symtab_upper_bound(abfd);
+		dynamic = TRUE;
+	}
+	if (storage < 0L)
+		return bfd_error(bfd_get_filename(abfd));
+
+	syms = malloc(storage);
+	if (dynamic)
+		symcount = bfd_canonicalize_dynamic_symtab(abfd, syms);
+	else
+		symcount = bfd_canonicalize_symtab(abfd, syms);
+
+	if (symcount < 0) {
+		free(syms);
+		return bfd_error(bfd_get_filename(abfd));
+	}
+
+	a2l->syms = syms;
+	return 0;
+}
+
+static void find_address_in_section(bfd *abfd, asection *section, void *data)
+{
+	bfd_vma pc, vma;
+	bfd_size_type size;
+	struct a2l_data *a2l = data;
+	flagword flags;
+
+	if (a2l->found)
+		return;
+
+#ifdef bfd_get_section_flags
+	flags = bfd_get_section_flags(abfd, section);
+#else
+	flags = bfd_section_flags(section);
+#endif
+	if ((flags & SEC_ALLOC) == 0)
+		return;
+
+	pc = a2l->addr;
+#ifdef bfd_get_section_vma
+	vma = bfd_get_section_vma(abfd, section);
+#else
+	vma = bfd_section_vma(section);
+#endif
+#ifdef bfd_get_section_size
+	size = bfd_get_section_size(section);
+#else
+	size = bfd_section_size(section);
+#endif
+
+	if (pc < vma || pc >= vma + size)
+		return;
+
+	a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma,
+					   &a2l->filename, &a2l->funcname,
+					   &a2l->line);
+
+	if (a2l->filename && !strlen(a2l->filename))
+		a2l->filename = NULL;
+}
+
+static struct a2l_data *addr2line_init(const char *path)
+{
+	bfd *abfd;
+	struct a2l_data *a2l = NULL;
+
+	abfd = bfd_openr(path, NULL);
+	if (abfd == NULL)
+		return NULL;
+
+	if (!bfd_check_format(abfd, bfd_object))
+		goto out;
+
+	a2l = zalloc(sizeof(*a2l));
+	if (a2l == NULL)
+		goto out;
+
+	a2l->abfd = abfd;
+	a2l->input = strdup(path);
+	if (a2l->input == NULL)
+		goto out;
+
+	if (slurp_symtab(abfd, a2l))
+		goto out;
+
+	return a2l;
+
+out:
+	if (a2l) {
+		zfree((char **)&a2l->input);
+		free(a2l);
+	}
+	bfd_close(abfd);
+	return NULL;
+}
+
+static void addr2line_cleanup(struct a2l_data *a2l)
+{
+	if (a2l->abfd)
+		bfd_close(a2l->abfd);
+	zfree((char **)&a2l->input);
+	zfree(&a2l->syms);
+	free(a2l);
+}
+
+#define MAX_INLINE_NEST 1024
+
+static int inline_list__append_dso_a2l(struct dso *dso,
+				       struct inline_node *node,
+				       struct symbol *sym)
+{
+	struct a2l_data *a2l = dso->a2l;
+	struct symbol *inline_sym = new_inline_sym(dso, sym, a2l->funcname);
+	char *srcline = NULL;
+
+	if (a2l->filename)
+		srcline = srcline_from_fileline(a2l->filename, a2l->line);
+
+	return inline_list__append(inline_sym, srcline, node);
+}
+
+static int addr2line(const char *dso_name, u64 addr,
+		     char **file, unsigned int *line, struct dso *dso,
+		     bool unwind_inlines, struct inline_node *node,
+		     struct symbol *sym)
+{
+	int ret = 0;
+	struct a2l_data *a2l = dso->a2l;
+
+	if (!a2l) {
+		dso->a2l = addr2line_init(dso_name);
+		a2l = dso->a2l;
+	}
+
+	if (a2l == NULL) {
+		if (!symbol_conf.disable_add2line_warn)
+			pr_warning("addr2line_init failed for %s\n", dso_name);
+		return 0;
+	}
+
+	a2l->addr = addr;
+	a2l->found = false;
+
+	bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l);
+
+	if (!a2l->found)
+		return 0;
+
+	if (unwind_inlines) {
+		int cnt = 0;
+
+		if (node && inline_list__append_dso_a2l(dso, node, sym))
+			return 0;
+
+		while (bfd_find_inliner_info(a2l->abfd, &a2l->filename,
+					     &a2l->funcname, &a2l->line) &&
+		       cnt++ < MAX_INLINE_NEST) {
+
+			if (a2l->filename && !strlen(a2l->filename))
+				a2l->filename = NULL;
+
+			if (node != NULL) {
+				if (inline_list__append_dso_a2l(dso, node, sym))
+					return 0;
+				// found at least one inline frame
+				ret = 1;
+			}
+		}
+	}
+
+	if (file) {
+		*file = a2l->filename ? strdup(a2l->filename) : NULL;
+		ret = *file ? 1 : 0;
+	}
+
+	if (line)
+		*line = a2l->line;
+
+	return ret;
+}
+
+void dso__free_a2l(struct dso *dso)
+{
+	struct a2l_data *a2l = dso->a2l;
+
+	if (!a2l)
+		return;
+
+	addr2line_cleanup(a2l);
+
+	dso->a2l = NULL;
+}
+
+static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
+					struct dso *dso, struct symbol *sym)
+{
+	struct inline_node *node;
+
+	node = zalloc(sizeof(*node));
+	if (node == NULL) {
+		perror("not enough memory for the inline node");
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&node->val);
+	node->addr = addr;
+
+	addr2line(dso_name, addr, NULL, NULL, dso, true, node, sym);
+	return node;
+}
+
+#else /* HAVE_LIBBFD_SUPPORT */
+
+static int filename_split(char *filename, unsigned int *line_nr)
+{
+	char *sep;
+
+	sep = strchr(filename, '\n');
+	if (sep)
+		*sep = '\0';
+
+	if (!strcmp(filename, "??:0"))
+		return 0;
+
+	sep = strchr(filename, ':');
+	if (sep) {
+		*sep++ = '\0';
+		*line_nr = strtoul(sep, NULL, 0);
+		return 1;
+	}
+
+	return 0;
+}
+
+static int addr2line(const char *dso_name, u64 addr,
+		     char **file, unsigned int *line_nr,
+		     struct dso *dso __maybe_unused,
+		     bool unwind_inlines __maybe_unused,
+		     struct inline_node *node __maybe_unused,
+		     struct symbol *sym __maybe_unused)
+{
+	FILE *fp;
+	char cmd[PATH_MAX];
+	char *filename = NULL;
+	size_t len;
+	int ret = 0;
+
+	scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64,
+		  dso_name, addr);
+
+	fp = popen(cmd, "r");
+	if (fp == NULL) {
+		pr_warning("popen failed for %s\n", dso_name);
+		return 0;
+	}
+
+	if (getline(&filename, &len, fp) < 0 || !len) {
+		pr_warning("addr2line has no output for %s\n", dso_name);
+		goto out;
+	}
+
+	ret = filename_split(filename, line_nr);
+	if (ret != 1) {
+		free(filename);
+		goto out;
+	}
+
+	*file = filename;
+
+out:
+	pclose(fp);
+	return ret;
+}
+
+void dso__free_a2l(struct dso *dso __maybe_unused)
+{
+}
+
+static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
+					struct dso *dso __maybe_unused,
+					struct symbol *sym)
+{
+	FILE *fp;
+	char cmd[PATH_MAX];
+	struct inline_node *node;
+	char *filename = NULL;
+	char *funcname = NULL;
+	size_t filelen, funclen;
+	unsigned int line_nr = 0;
+
+	scnprintf(cmd, sizeof(cmd), "addr2line -e %s -i -f %016"PRIx64,
+		  dso_name, addr);
+
+	fp = popen(cmd, "r");
+	if (fp == NULL) {
+		pr_err("popen failed for %s\n", dso_name);
+		return NULL;
+	}
+
+	node = zalloc(sizeof(*node));
+	if (node == NULL) {
+		perror("not enough memory for the inline node");
+		goto out;
+	}
+
+	INIT_LIST_HEAD(&node->val);
+	node->addr = addr;
+
+	/* addr2line -f generates two lines for each inlined functions */
+	while (getline(&funcname, &funclen, fp) != -1) {
+		char *srcline;
+		struct symbol *inline_sym;
+
+		strim(funcname);
+
+		if (getline(&filename, &filelen, fp) == -1)
+			goto out;
+
+		if (filename_split(filename, &line_nr) != 1)
+			goto out;
+
+		srcline = srcline_from_fileline(filename, line_nr);
+		inline_sym = new_inline_sym(dso, sym, funcname);
+
+		if (inline_list__append(inline_sym, srcline, node) != 0) {
+			free(srcline);
+			if (inline_sym && inline_sym->inlined)
+				symbol__delete(inline_sym);
+			goto out;
+		}
+	}
+
+out:
+	pclose(fp);
+	free(filename);
+	free(funcname);
+
+	return node;
+}
+
+#endif /* HAVE_LIBBFD_SUPPORT */
+
+/*
+ * Number of addr2line failures (without success) before disabling it for that
+ * dso.
+ */
+#define A2L_FAIL_LIMIT 123
+
+char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
+		  bool show_sym, bool show_addr, bool unwind_inlines,
+		  u64 ip)
+{
+	char *file = NULL;
+	unsigned line = 0;
+	char *srcline;
+	const char *dso_name;
+
+	if (!dso->has_srcline)
+		goto out;
+
+	dso_name = dso__name(dso);
+	if (dso_name == NULL)
+		goto out;
+
+	if (!addr2line(dso_name, addr, &file, &line, dso,
+		       unwind_inlines, NULL, sym))
+		goto out;
+
+	srcline = srcline_from_fileline(file, line);
+	free(file);
+
+	if (!srcline)
+		goto out;
+
+	dso->a2l_fails = 0;
+
+	return srcline;
+
+out:
+	if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
+		dso->has_srcline = 0;
+		dso__free_a2l(dso);
+	}
+
+	if (!show_addr)
+		return (show_sym && sym) ?
+			    strndup(sym->name, sym->namelen) : NULL;
+
+	if (sym) {
+		if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "",
+					ip - sym->start) < 0)
+			return SRCLINE_UNKNOWN;
+	} else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0)
+		return SRCLINE_UNKNOWN;
+	return srcline;
+}
+
+/* Returns filename and fills in line number in line */
+char *get_srcline_split(struct dso *dso, u64 addr, unsigned *line)
+{
+	char *file = NULL;
+	const char *dso_name;
+
+	if (!dso->has_srcline)
+		goto out;
+
+	dso_name = dso__name(dso);
+	if (dso_name == NULL)
+		goto out;
+
+	if (!addr2line(dso_name, addr, &file, line, dso, true, NULL, NULL))
+		goto out;
+
+	dso->a2l_fails = 0;
+	return file;
+
+out:
+	if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
+		dso->has_srcline = 0;
+		dso__free_a2l(dso);
+	}
+
+	return NULL;
+}
+
+void free_srcline(char *srcline)
+{
+	if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
+		free(srcline);
+}
+
+char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
+		  bool show_sym, bool show_addr, u64 ip)
+{
+	return __get_srcline(dso, addr, sym, show_sym, show_addr, false, ip);
+}
+
+struct srcline_node {
+	u64			addr;
+	char			*srcline;
+	struct rb_node		rb_node;
+};
+
+void srcline__tree_insert(struct rb_root_cached *tree, u64 addr, char *srcline)
+{
+	struct rb_node **p = &tree->rb_root.rb_node;
+	struct rb_node *parent = NULL;
+	struct srcline_node *i, *node;
+	bool leftmost = true;
+
+	node = zalloc(sizeof(struct srcline_node));
+	if (!node) {
+		perror("not enough memory for the srcline node");
+		return;
+	}
+
+	node->addr = addr;
+	node->srcline = srcline;
+
+	while (*p != NULL) {
+		parent = *p;
+		i = rb_entry(parent, struct srcline_node, rb_node);
+		if (addr < i->addr)
+			p = &(*p)->rb_left;
+		else {
+			p = &(*p)->rb_right;
+			leftmost = false;
+		}
+	}
+	rb_link_node(&node->rb_node, parent, p);
+	rb_insert_color_cached(&node->rb_node, tree, leftmost);
+}
+
+char *srcline__tree_find(struct rb_root_cached *tree, u64 addr)
+{
+	struct rb_node *n = tree->rb_root.rb_node;
+
+	while (n) {
+		struct srcline_node *i = rb_entry(n, struct srcline_node,
+						  rb_node);
+
+		if (addr < i->addr)
+			n = n->rb_left;
+		else if (addr > i->addr)
+			n = n->rb_right;
+		else
+			return i->srcline;
+	}
+
+	return NULL;
+}
+
+void srcline__tree_delete(struct rb_root_cached *tree)
+{
+	struct srcline_node *pos;
+	struct rb_node *next = rb_first_cached(tree);
+
+	while (next) {
+		pos = rb_entry(next, struct srcline_node, rb_node);
+		next = rb_next(&pos->rb_node);
+		rb_erase_cached(&pos->rb_node, tree);
+		free_srcline(pos->srcline);
+		zfree(&pos);
+	}
+}
+
+struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr,
+					    struct symbol *sym)
+{
+	const char *dso_name;
+
+	dso_name = dso__name(dso);
+	if (dso_name == NULL)
+		return NULL;
+
+	return addr2inlines(dso_name, addr, dso, sym);
+}
+
+void inline_node__delete(struct inline_node *node)
+{
+	struct inline_list *ilist, *tmp;
+
+	list_for_each_entry_safe(ilist, tmp, &node->val, list) {
+		list_del_init(&ilist->list);
+		free_srcline(ilist->srcline);
+		/* only the inlined symbols are owned by the list */
+		if (ilist->symbol && ilist->symbol->inlined)
+			symbol__delete(ilist->symbol);
+		free(ilist);
+	}
+
+	free(node);
+}
+
+void inlines__tree_insert(struct rb_root_cached *tree,
+			  struct inline_node *inlines)
+{
+	struct rb_node **p = &tree->rb_root.rb_node;
+	struct rb_node *parent = NULL;
+	const u64 addr = inlines->addr;
+	struct inline_node *i;
+	bool leftmost = true;
+
+	while (*p != NULL) {
+		parent = *p;
+		i = rb_entry(parent, struct inline_node, rb_node);
+		if (addr < i->addr)
+			p = &(*p)->rb_left;
+		else {
+			p = &(*p)->rb_right;
+			leftmost = false;
+		}
+	}
+	rb_link_node(&inlines->rb_node, parent, p);
+	rb_insert_color_cached(&inlines->rb_node, tree, leftmost);
+}
+
+struct inline_node *inlines__tree_find(struct rb_root_cached *tree, u64 addr)
+{
+	struct rb_node *n = tree->rb_root.rb_node;
+
+	while (n) {
+		struct inline_node *i = rb_entry(n, struct inline_node,
+						 rb_node);
+
+		if (addr < i->addr)
+			n = n->rb_left;
+		else if (addr > i->addr)
+			n = n->rb_right;
+		else
+			return i;
+	}
+
+	return NULL;
+}
+
+void inlines__tree_delete(struct rb_root_cached *tree)
+{
+	struct inline_node *pos;
+	struct rb_node *next = rb_first_cached(tree);
+
+	while (next) {
+		pos = rb_entry(next, struct inline_node, rb_node);
+		next = rb_next(&pos->rb_node);
+		rb_erase_cached(&pos->rb_node, tree);
+		inline_node__delete(pos);
+	}
+}